13 votes
Accepted

Loudness unit, as logarithm of mean squared?

Short Answer: Using the mean of the square (or the square of the RMS) represents the energy in the acoustical signal. Longer Answer: Sound waves that you hear are made of vibrations in the air. There ...
Michael M's user avatar
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8 votes

Difference Between Particle Velocity and Wave Velocity in a Longitudinal Wave

It might seem intuitive to assume that the particle velocity should be identical to the wave velocity No, particle velocity and wave velocity are different things. Look at the longitudinal wave in ...
Thomas Fritsch's user avatar
6 votes

Difference Between Particle Velocity and Wave Velocity in a Longitudinal Wave

Yes, there is a difference between particle velocity ($v_p$) and wave velocity ($v$) in a longitudinal wave. The wave velocity is the speed at which wavefronts propagate, calculated as $v = \lambda f$,...
cconsta1's user avatar
  • 810
4 votes

Difference Between Particle Velocity and Wave Velocity in a Longitudinal Wave

This wave is a disturbance of a medium that travels steadily onward. A given time, some particle is being disturbed. It moves back and forth. This is particle velocity. Wave velocity is about how long ...
mmesser314's user avatar
  • 38.1k
2 votes
Accepted

Why and how white noise cancels other background noises?

Introduction First of all, let me state that the clip you provided does not contain white noise, but some kind of filtered noise. I haven’t analysed it to conclude on the “colour” of the noise but it ...
ZaellixA's user avatar
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2 votes

Why does air vibration produce a spherical wavefront and not a plane wavefront?

Assuming that the question is related to sound waves in air, then when an object sets air into vibration, it sends out sound waves in all directions away from the point of vibration. This creates ...
cconsta1's user avatar
  • 810
1 vote

Loudness unit, as logarithm of mean squared?

Michael's answer is fantastic, but since someone might find this through specifically searching for loudness units, I thought it worth writing an additional answer more specific to the LUFS unit. As ...
TrisT's user avatar
  • 193
1 vote

How can I determine sound speed of ions in plasma sheath

The formal definition for the speed of sound is given as: $$ C_{s}^{2} = \frac{ \partial P }{ \partial \rho } \tag{0} $$ where $P$ is the total thermal pressure and $\rho$ is the total mass density. ...
honeste_vivere's user avatar
1 vote

Do wavenumber pairs exist for standing waves?

I'm just going to focus on the spatial Fourier transform / spatial dependence in this answer, so the answer can be written in terms of properties of the Fourier transform; calculating the time ...
Andrew's user avatar
  • 47.9k
1 vote

How to justify sound propagation is a linear time-invariant (LTI) system?

Sound waves are not linear, but since we rarely have shock waves indoors, we can usually approximate the sound wave equation as linear for room acoustics. While simple boundary conditions will, in ...
John Doty's user avatar
  • 20.5k
1 vote

Mysterious sound from measurement setup in "zero measurement"

If your anechoic chamber had ventilation provided by the HVAC system in your building, the most likely cause was fan noise coming in through the vent ducts. Since the motors that run the fan operate ...
niels nielsen's user avatar
1 vote

Why does air vibration produce a spherical wavefront and not a plane wavefront?

Introduction The assumption that the vibration of objects (the shape of the resulting wavefront is not dependent only on the material but other factors too) produces spherically expanding waves is ...
ZaellixA's user avatar
  • 1,777

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